I was actually in the middle of this mess on another train (9747). There was much more going on during this time, including:
-Train 3448 (5:00 at Suburban to Warminster) was cancelled due to downed wires on the Elwyn Line. Inbound Elwyn service suspended, outbound delays up to 40 minutes past 49th Street.
-Wire train through Center City tunnel on Track 4 at 5 PM, presumably Elwyn-bound.
-Trains stacked up on Track 3 of Center City tunnel to make way for wire train.
-Mass confusion on the platforms since the GVF and the train normally preceding it (Exp Bryn Mawr, Loc Paoli) were on different tracks at the same time with the same equipment (PP) after the wire train pulled out.
-While all this was happening, Train 2555 (4:47 at Suburban to Bryn Mawr, 4 car set of SL4s) was stopped on Track 4 next to 22nd Street bridge.
-Track 2 was alternating traffic between eastbound and westbound trains between Suburban and 30th Streets.
My train squeaked on through around sometime after 5:20 (running around 10 late). Switched to Track 3 after Suburban. As I passed Train 2555, I noticed that the end doors of the train were open. I assumed power was out on the train and the doors were open for ventilation, but the markers and headlights were still on. After passing 2555, I heard some clacking and looked up to see the wire bouncing rather violently over Track 4. No idea why it was doing that, but it scared the beejeezus out of me.
Just a witness account.
Lines Frequented: SEPTA Trenton Line, West Trenton Line, Warminster Line; NJT Northeast Corridor Amtrak Northeast Corridor (PHL-NYP).